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Miniature X-band GaAs MMIC analog and bi-phase modulators for spaceborne communications applications

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2 Author(s)
Mysoor, N.R. ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA ; Ali, F.

The design concepts, analyses, and the development of GaAs monolithic microwave integrated circuit (MMIC) linear-phase and digital modulators for the next generation of spaceborne communications systems are summarized. The design approach uses a very compact lumped-element, quadrature hybrid, and MESFET-varactors to provide low-loss and well-controlled phase performance for deep-space transponder (DST) applications. The measured results of the MESFET-diode show a capacitance range of 2:1 under reverse bias, and a Q of 38 at 10 GHz. Three cascaded sections of hybrid-coupled reflection phase shifters have been modeled and simulations performed to provide an X-band (8415+or-50 MHz) DST phase modulator with +or-2.5 radians of peak phase deviation.<>

Published in:

Aerospace Applications Conference, 1992. Digest., 1992 IEEE

Date of Conference:

2-7 Feb. 1992